13221225 has 30 divisors (see below), whose sum is σ = 24494030. Its totient is φ = 7050240.

The previous prime is 13221209. The next prime is 13221227. The reversal of 13221225 is 52212231.

It can be written as a sum of positive squares in 3 ways, for example, as 729 + 13220496 = 27^2 + 3636^2 .

It is not a de Polignac number, because 13221225 - 2⁴ = 13221209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13221198 and 13221207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221227) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1240 + ... + 5289.

Almost surely, 2^13221225 is an apocalyptic number.

13221225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13221225 is a deficient number, since it is larger than the sum of its proper divisors (11272805).

13221225 is an equidigital number, since it uses as much as digits as its factorization.

13221225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6551 (or 6537 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 13221225 is about 3636.1002461428. The cubic root of 13221225 is about 236.4597532480.

Adding to 13221225 its reverse (52212231), we get a palindrome (65433456).

The spelling of 13221225 in words is "thirteen million, two hundred twenty-one thousand, two hundred twenty-five".